WESCO International (WCC) 10-K 2008 FY Annual report

Exhibit 32.2

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of WESCO International, Inc. (the “Company”) on Form 10-K for the period ended December 31, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

Date: February 27, 2009	By:	/s/ Stephen A. Van Oss
		Stephen A. Van Oss
		Director and Senior Vice President and Chief Financial and Administrative Officer